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C-Coupler: A Coupler for Earth
System Model
Xiaoge Wang, Li Liu, Guangwen Yang
Department of Computer Science and Technology
Center for Earth System Science
Tsinghua University, Beijing, China
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Outline
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Background
Design Consideration
Architecture
Details
Future work
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Two Projects
– “Software platform for Supporting Earth System Model
Research and Development” (210-2012)
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Massive Data Management
Visualization for ESM
Integrated Software Development Environment
Tools for Parallel Programming
Application Showcases
– “ Design of High-efficiency Parallel Computing Algorithms
and Parallel Coupler for Earth System Model” (2010-2012)
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Parallel Numerical Algorithms and Performance Optimization
Framework for Parallel Application Development
Parallel Coupling Technology for ESM
Development of a High-performance Physical Climate System Model4
Showcase App
IDE
Project
Management
Editor
View
Tools Lib
Plugin
Management
Data Mngt.
Data Conv.
Template Lib-based
Application
Development Wizard
Mode/Module
Lib
Coupler Module
Radiation Module
Parallel
Encapsulation
Compile, Debug,
Deploy & Runtime
Cumulus Convection Time integration
Parameterized Module
Module
MPI
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Boundary
Layer Module
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Fortran
MPMD Debugger
JASMIN
Perf. Analysis
Visualization
Results
Comp.
Solver Module
C/C++
Diagnosis
Checkpoint
Monitor
Chart/Report
Ver. Control
Resource
Virtualization
Heterogeneous
Resources
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ShenWei
Galaxy
Dawning
Lenovo
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Coupling Technology Today in China
• Coupling software in use
– NCAR couplers
• Cpl5/Cpl6: IAP (LASG), Beijing Normal University, National Climate Center
– OASIS
• OASIS3/OASIS4: regional coupling, atm-ocn coupling, typhoon model
coupling
• Need for a Coupler
– Which coupler should be used?
– Develop a new coupler to meet the need?
• C-Coupler project started in 2010
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Demand for Coupler
• User Friendliness and Flexibility
– Easier parameter control
– Easier customization of coupling method
• Higher Performance
– Better Scalability
– System-level Load balance
– Efficient global communication
• More Functions
– Interactive ensemble
– 3D coupling
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Outline
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Background
Design Consideration
Architecture
Details
Future work
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General Idea in a Picture
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Software Technologies
• Component oriented programming
– Component based integration
– Component reuse
• Model reuse
• Coupling algorithm reuse
• Software configuration management
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Model configuration
Coupling algorithm configuration
Coupler configuration
ESM case configuration
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Features of C-Coupler
• User friendly and flexible
– Both GUI and scripts for configuration
– More configurable points
• High performance
– Efficient communication
• Parallel communication
• Asynchronous communication
• Direct communication between models
– System-level load balance
• Monitoring the performance of models and coupler
• Schedule the coupling computation among models and the coupler
– PIO
• A PIO-specific module based on PNetCDF
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Features of C-Coupler (cont.)
• Supporting Functions
– Interactive ensemble
– 3D coupling
– Regional coupling
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Outline
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Background
Design Consideration
Architecture
Details
Future work
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Architecture(1)
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Architecture(2)
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Outline
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Background
Design Consideration
Architecture
Some Details
Future work
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Model Configuration
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Coupling Algorithm Configuration
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Coupler Configuration
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ESM Case Configuration
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Coupling Driver
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Outline
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Background
Design consideration
Architecture
Some Details
Future work
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Future Work
• Complete the first version of C-coupler
• FGOALS
• Integrity and robustness
• Scalability and efficiency
• Portability and adaptability
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Thanks!
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Q&A
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